Lemony Pasta With Asparagus and White Beans

Name: Lemony Pasta With Asparagus and White Beans
Cook time: 30 min
Total time: 30 min
Cuisine: American
Ingredients: 1 large lemon, plus more fresh lemon juice for serving; 1 (15-ounce) can white beans, rinsed; 1 shallot, finely diced, or 2 tablespoons finely diced red onion; 3 garlic cloves (2 thinly sliced, 1 finely grated); 1/4 teaspoon red-pepper flakes, plus more to taste; Kosher salt; 4 tablespoons extra-virgin olive oil; 1 pound short pasta, such as campanelle, fusilli or farfalle; 2 bunches asparagus (about 2 pounds), ends trimmed, stalks sliced into 1/2-inch pieces; 2/3 cup coarsely chopped Italian parsley leaves; 1/2 cup grated Parmesan, plus more for serving; Black pepper